Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d72eb89030bddd9…

MALICIOUS

PDF

108.9 KB Created: 2021-07-20 12:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c8333a2b93635833d7aeedaf1773ccb SHA-1: 0d2bd6066021dc094807f016b8b92bfbc7699286 SHA-256: 1d72eb89030bddd9c1cdabb3acb5cadc987cf9be325b693a21aba076466266c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/13b71e26a9be9604561ba4b6990c1b17/fenabanezutilixazulevofe.pdf In PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2eeaecf1---21292238153.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/14e65a5fb9c8c92a5f59da6af599f68d/50909449937.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/36986369416.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762ffe75dfc---gonezalijotojikuwuz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e928dc8b---78841797436.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/96587064067.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wimetataw.pdfIn PDF document text
    • http://kesifveotesi.com/files/jowipigogaxebirefir.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/32607107164.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/70sjmrcf61p1a79ect0b3nc7eq/roxajelibawifisule.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dd462754---diwabisiloxevavujoposan.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc13e95780---mamurimetowu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98e609ffc---87573105117.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/titabamofe.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/20667426906.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pv9s9u94304j2bbjihsq3l15sg/43987347199.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd3d5dfc5---makudipipale.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/mefepumozu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccafc0a62---xuzekajabozuju.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6fbfc9c4ed3208203dbcdac40c846aa5/suguduse.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/ruxoxozawewilu.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/tadodova.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/zivim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=second+order+active+filterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 18640 bytes
SHA-256: 6e2112803ece1825163dc3b01cf059178101e8208dc243b5c1faf97d17942963
font_01_sfnt_off00017678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17678 10440 bytes
SHA-256: 449833c8c9a25915849914ca2103a3cc1bffad35834cd049fb476df50046a1eb
font_02_sfnt_off00018e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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